How uandu GmbH Generated €5,312.53 with a WhatsApp Hack

Initial Situation

uandu GmbH, an innovative online retailer for lifestyle and everyday products, wanted to make their Halloween campaign more efficient. The goal: generate more revenue per campaign – without driving up WhatsApp META costs unnecessarily.

Solution: Retargeting Within the 24h Conversation Window

With Chatarmin, uandu applied a clever WhatsApp hack:

• Second message to non-buyers: All contacts who did not convert after the first message received a follow-up just a few hours later.
• Cost savings: Since both messages were sent within the 24h window, META costs were only charged once.
• Klaviyo + Shopify integration: Enabled easy creation of a non-buyer segment and automated follow-up messages.

Results

This smart Halloween campaign delivered impressive results:

• €5,312.53 WhatsApp revenue 💰
• €974.39 WhatsApp costs
• 5.45X ROWAS 🚀
• €51.60 AOV 📦

Conclusion

This case study shows how WhatsApp retargeting within the 24h conversation window is a true performance booster. By combining precise segmentation, smart cost optimization, and automated setup through Chatarmin, uandu significantly increased the efficiency of their WhatsApp campaign.

👉 Want to learn how your brand can leverage WhatsApp retargeting? Talk to our team